I am going to move my betta to the small tank for a while, after treatment is done (first water change is today). But that's mainly so I can take the divider out to scrub the area/the divider. The two ottos tend to ignore it, so a small amount of algae has grown on it.
I thought of another thing today though. Because it's summer, we're under a boil water advisory for drinking water. (Actually, I think we're supposed to boil water all year - we buy bottled water, so I'm not 100% sure.) Would that have any effect on my tank, if I don't boil it for them? I use Seachem Prime to get rid of impurities, but still.. it's a thought I had today.
Oh, just adding, after the 2 days of treatment, he seems to be a lot perkier. Can't tell if the hole is looking better because of the lack of proper light (we have a plant grow lamp hanging above it for now, it's not too hot). Was eating with the rest of the gang (if a little slower than them), but was eating. That's a bonus.
I'll keep walmart in mind though, for the NitrAte/NitrIte kits. The closest is about an hour away, so we don't go very often.